<!DOCTYPE html><html><head>
  <title>:nth-of-type() pseudo-class</title>
  <style type="text/css">.red { background-color : red }
p:nth-of-type(3) { background-color : lime }
dl > :nth-of-type(3n+1) { background-color : lime }
</style>
  <link rel="author" title="Daniel Glazman" href="http://glazman.org/">
  <link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors"> <!-- bogus link to make sure it gets found -->
  <meta name="flags" content="">
 </head>
 <body>
<p>This paragraph is here only to fill space in the DOM</p>
<address>And this address too..</address>
<p>So does this paragraph !</p>
<p class="red">But this one should have green background</p>
<dl>
  <dt class="red">First definition term that should have green background</dt>
    <dd class="red">First definition that should have green background</dd>
  <dt>Second definition term</dt>
    <dd>Second definition</dd>
  <dt>Third definition term</dt>
    <dd>Third definition</dd>
  <dt class="red">Fourth definition term that should have green background</dt>
    <dd class="red">Fourth definition that should have green background</dd>
  <dt>Fifth definition term</dt>
    <dd>Fifth definition</dd>
  <dt>Sixth definition term</dt>
    <dd>Sixth definition</dd>
</dl>

</body></html>